The park itself is fairly small once you make it to the top - if you make it! There should be some sort of warning before entering to say how steep and how high this trek is!
My friend and I are fairly active twenty something year olds and we walked up in 27 degrees heat - we had to stop multiple times. Just make sure you go stocked with water.
The monkeys are cute and June/July are when they have babies so plenty of cute little ones to be seen. They don’t get too close to you but close enough to get some good pictures.
We paid Y550 each.